fs/dlm/rcom.c

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5 **  Copyright (C) 2005-2008 Red Hat, Inc.  All rights reserved.
   6 **
   7 **  This copyrighted material is made available to anyone wishing to use,
   8 **  modify, copy, or redistribute it subject to the terms and conditions
   9 **  of the GNU General Public License v.2.
  10 **
  11 *******************************************************************************
  12 ******************************************************************************/
  13
  14 #include "dlm_internal.h"
  15 #include "lockspace.h"
  16 #include "member.h"
  17 #include "lowcomms.h"
  18 #include "midcomms.h"
  19 #include "rcom.h"
  20 #include "recover.h"
  21 #include "dir.h"
  22 #include "config.h"
  23 #include "memory.h"
  24 #include "lock.h"
  25 #include "util.h"
  26
  27 static int rcom_response(struct dlm_ls *ls)
  28 {
  29         return test_bit(LSFL_RCOM_READY, &ls->ls_flags);
  30 }
  31
  32 static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
  33                        struct dlm_rcom **rc_ret, struct dlm_mhandle **mh_ret)
  34 {
  35         struct dlm_rcom *rc;
  36         struct dlm_mhandle *mh;
  37         char *mb;
  38         int mb_len = sizeof(struct dlm_rcom) + len;
  39
  40         mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, GFP_NOFS, &mb);
  41         if (!mh) {
  42                 log_print("create_rcom to %d type %d len %d ENOBUFS",
  43                           to_nodeid, type, len);
  44                 return -ENOBUFS;
  45         }
  46         memset(mb, 0, mb_len);
  47
  48         rc = (struct dlm_rcom *) mb;
  49
  50         rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
  51         rc->rc_header.h_lockspace = ls->ls_global_id;
  52         rc->rc_header.h_nodeid = dlm_our_nodeid();
  53         rc->rc_header.h_length = mb_len;
  54         rc->rc_header.h_cmd = DLM_RCOM;
  55
  56         rc->rc_type = type;
  57
  58         spin_lock(&ls->ls_recover_lock);
  59         rc->rc_seq = ls->ls_recover_seq;
  60         spin_unlock(&ls->ls_recover_lock);
  61
  62         *mh_ret = mh;
  63         *rc_ret = rc;
  64         return 0;
  65 }
  66
  67 static void send_rcom(struct dlm_ls *ls, struct dlm_mhandle *mh,
  68                       struct dlm_rcom *rc)
  69 {
  70         dlm_rcom_out(rc);
  71         dlm_lowcomms_commit_buffer(mh);
  72 }
  73
  74 static void set_rcom_status(struct dlm_ls *ls, struct rcom_status *rs,
  75                             uint32_t flags)
  76 {
  77         rs->rs_flags = cpu_to_le32(flags);
  78 }
  79
  80 /* When replying to a status request, a node also sends back its
  81    configuration values.  The requesting node then checks that the remote
  82    node is configured the same way as itself. */
  83
  84 static void set_rcom_config(struct dlm_ls *ls, struct rcom_config *rf,
  85                             uint32_t num_slots)
  86 {
  87         rf->rf_lvblen = cpu_to_le32(ls->ls_lvblen);
  88         rf->rf_lsflags = cpu_to_le32(ls->ls_exflags);
  89
  90         rf->rf_our_slot = cpu_to_le16(ls->ls_slot);
  91         rf->rf_num_slots = cpu_to_le16(num_slots);
  92         rf->rf_generation =  cpu_to_le32(ls->ls_generation);
  93 }
  94
  95 static int check_rcom_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
  96 {
  97         struct rcom_config *rf = (struct rcom_config *) rc->rc_buf;
  98
  99         if ((rc->rc_header.h_version & 0xFFFF0000) != DLM_HEADER_MAJOR) {
 100                 log_error(ls, "version mismatch: %x nodeid %d: %x",
 101                           DLM_HEADER_MAJOR | DLM_HEADER_MINOR, nodeid,
 102                           rc->rc_header.h_version);
 103                 return -EPROTO;
 104         }
 105
 106         if (le32_to_cpu(rf->rf_lvblen) != ls->ls_lvblen ||
 107             le32_to_cpu(rf->rf_lsflags) != ls->ls_exflags) {
 108                 log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x",
 109                           ls->ls_lvblen, ls->ls_exflags, nodeid,
 110                           le32_to_cpu(rf->rf_lvblen),
 111                           le32_to_cpu(rf->rf_lsflags));
 112                 return -EPROTO;
 113         }
 114         return 0;
 115 }
 116
 117 static void allow_sync_reply(struct dlm_ls *ls, uint64_t *new_seq)
 118 {
 119         spin_lock(&ls->ls_rcom_spin);
 120         *new_seq = ++ls->ls_rcom_seq;
 121         set_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
 122         spin_unlock(&ls->ls_rcom_spin);
 123 }
 124
 125 static void disallow_sync_reply(struct dlm_ls *ls)
 126 {
 127         spin_lock(&ls->ls_rcom_spin);
 128         clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
 129         clear_bit(LSFL_RCOM_READY, &ls->ls_flags);
 130         spin_unlock(&ls->ls_rcom_spin);
 131 }
 132
 133 /*
 134  * low nodeid gathers one slot value at a time from each node.
 135  * it sets need_slots=0, and saves rf_our_slot returned from each
 136  * rcom_config.
 137  *
 138  * other nodes gather all slot values at once from the low nodeid.
 139  * they set need_slots=1, and ignore the rf_our_slot returned from each
 140  * rcom_config.  they use the rf_num_slots returned from the low
 141  * node's rcom_config.
 142  */
 143
 144 int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags)
 145 {
 146         struct dlm_rcom *rc;
 147         struct dlm_mhandle *mh;
 148         int error = 0;
 149
 150         ls->ls_recover_nodeid = nodeid;
 151
 152         if (nodeid == dlm_our_nodeid()) {
 153                 rc = ls->ls_recover_buf;
 154                 rc->rc_result = dlm_recover_status(ls);
 155                 goto out;
 156         }
 157
 158         error = create_rcom(ls, nodeid, DLM_RCOM_STATUS,
 159                             sizeof(struct rcom_status), &rc, &mh);
 160         if (error)
 161                 goto out;
 162
 163         set_rcom_status(ls, (struct rcom_status *)rc->rc_buf, status_flags);
 164
 165         allow_sync_reply(ls, &rc->rc_id);
 166         memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size);
 167
 168         send_rcom(ls, mh, rc);
 169
 170         error = dlm_wait_function(ls, &rcom_response);
 171         disallow_sync_reply(ls);
 172         if (error)
 173                 goto out;
 174
 175         rc = ls->ls_recover_buf;
 176
 177         if (rc->rc_result == -ESRCH) {
 178                 /* we pretend the remote lockspace exists with 0 status */
 179                 log_debug(ls, "remote node %d not ready", nodeid);
 180                 rc->rc_result = 0;
 181                 error = 0;
 182         } else {
 183                 error = check_rcom_config(ls, rc, nodeid);
 184         }
 185
 186         /* the caller looks at rc_result for the remote recovery status */
 187  out:
 188         return error;
 189 }
 190
 191 static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 192 {
 193         struct dlm_rcom *rc;
 194         struct dlm_mhandle *mh;
 195         struct rcom_status *rs;
 196         uint32_t status;
 197         int nodeid = rc_in->rc_header.h_nodeid;
 198         int len = sizeof(struct rcom_config);
 199         int num_slots = 0;
 200         int error;
 201
 202         if (!dlm_slots_version(&rc_in->rc_header)) {
 203                 status = dlm_recover_status(ls);
 204                 goto do_create;
 205         }
 206
 207         rs = (struct rcom_status *)rc_in->rc_buf;
 208
 209         if (!(rs->rs_flags & DLM_RSF_NEED_SLOTS)) {
 210                 status = dlm_recover_status(ls);
 211                 goto do_create;
 212         }
 213
 214         spin_lock(&ls->ls_recover_lock);
 215         status = ls->ls_recover_status;
 216         num_slots = ls->ls_num_slots;
 217         spin_unlock(&ls->ls_recover_lock);
 218         len += num_slots * sizeof(struct rcom_slot);
 219
 220  do_create:
 221         error = create_rcom(ls, nodeid, DLM_RCOM_STATUS_REPLY,
 222                             len, &rc, &mh);
 223         if (error)
 224                 return;
 225
 226         rc->rc_id = rc_in->rc_id;
 227         rc->rc_seq_reply = rc_in->rc_seq;
 228         rc->rc_result = status;
 229
 230         set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, num_slots);
 231
 232         if (!num_slots)
 233                 goto do_send;
 234
 235         spin_lock(&ls->ls_recover_lock);
 236         if (ls->ls_num_slots != num_slots) {
 237                 spin_unlock(&ls->ls_recover_lock);
 238                 log_debug(ls, "receive_rcom_status num_slots %d to %d",
 239                           num_slots, ls->ls_num_slots);
 240                 rc->rc_result = 0;
 241                 set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, 0);
 242                 goto do_send;
 243         }
 244
 245         dlm_slots_copy_out(ls, rc);
 246         spin_unlock(&ls->ls_recover_lock);
 247
 248  do_send:
 249         send_rcom(ls, mh, rc);
 250 }
 251
 252 static void receive_sync_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 253 {
 254         spin_lock(&ls->ls_rcom_spin);
 255         if (!test_bit(LSFL_RCOM_WAIT, &ls->ls_flags) ||
 256             rc_in->rc_id != ls->ls_rcom_seq) {
 257                 log_debug(ls, "reject reply %d from %d seq %llx expect %llx",
 258                           rc_in->rc_type, rc_in->rc_header.h_nodeid,
 259                           (unsigned long long)rc_in->rc_id,
 260                           (unsigned long long)ls->ls_rcom_seq);
 261                 goto out;
 262         }
 263         memcpy(ls->ls_recover_buf, rc_in, rc_in->rc_header.h_length);
 264         set_bit(LSFL_RCOM_READY, &ls->ls_flags);
 265         clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
 266         wake_up(&ls->ls_wait_general);
 267  out:
 268         spin_unlock(&ls->ls_rcom_spin);
 269 }
 270
 271 int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
 272 {
 273         struct dlm_rcom *rc;
 274         struct dlm_mhandle *mh;
 275         int error = 0;
 276
 277         ls->ls_recover_nodeid = nodeid;
 278
 279         error = create_rcom(ls, nodeid, DLM_RCOM_NAMES, last_len, &rc, &mh);
 280         if (error)
 281                 goto out;
 282         memcpy(rc->rc_buf, last_name, last_len);
 283
 284         allow_sync_reply(ls, &rc->rc_id);
 285         memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size);
 286
 287         send_rcom(ls, mh, rc);
 288
 289         error = dlm_wait_function(ls, &rcom_response);
 290         disallow_sync_reply(ls);
 291  out:
 292         return error;
 293 }
 294
 295 static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 296 {
 297         struct dlm_rcom *rc;
 298         struct dlm_mhandle *mh;
 299         int error, inlen, outlen, nodeid;
 300
 301         nodeid = rc_in->rc_header.h_nodeid;
 302         inlen = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
 303         outlen = dlm_config.ci_buffer_size - sizeof(struct dlm_rcom);
 304
 305         error = create_rcom(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen, &rc, &mh);
 306         if (error)
 307                 return;
 308         rc->rc_id = rc_in->rc_id;
 309         rc->rc_seq_reply = rc_in->rc_seq;
 310
 311         dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen,
 312                               nodeid);
 313         send_rcom(ls, mh, rc);
 314 }
 315
 316 int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid)
 317 {
 318         struct dlm_rcom *rc;
 319         struct dlm_mhandle *mh;
 320         struct dlm_ls *ls = r->res_ls;
 321         int error;
 322
 323         error = create_rcom(ls, dir_nodeid, DLM_RCOM_LOOKUP, r->res_length,
 324                             &rc, &mh);
 325         if (error)
 326                 goto out;
 327         memcpy(rc->rc_buf, r->res_name, r->res_length);
 328         rc->rc_id = (unsigned long) r->res_id;
 329
 330         send_rcom(ls, mh, rc);
 331  out:
 332         return error;
 333 }
 334
 335 int dlm_send_rcom_lookup_dump(struct dlm_rsb *r, int to_nodeid)
 336 {
 337         struct dlm_rcom *rc;
 338         struct dlm_mhandle *mh;
 339         struct dlm_ls *ls = r->res_ls;
 340         int error;
 341
 342         error = create_rcom(ls, to_nodeid, DLM_RCOM_LOOKUP, r->res_length,
 343                             &rc, &mh);
 344         if (error)
 345                 goto out;
 346         memcpy(rc->rc_buf, r->res_name, r->res_length);
 347         rc->rc_id = 0xFFFFFFFF;
 348
 349         send_rcom(ls, mh, rc);
 350  out:
 351         return error;
 352 }
 353
 354 static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 355 {
 356         struct dlm_rcom *rc;
 357         struct dlm_mhandle *mh;
 358         int error, ret_nodeid, nodeid = rc_in->rc_header.h_nodeid;
 359         int len = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
 360
 361         error = create_rcom(ls, nodeid, DLM_RCOM_LOOKUP_REPLY, 0, &rc, &mh);
 362         if (error)
 363                 return;
 364
 365         if (rc_in->rc_id == 0xFFFFFFFF) {
 366                 log_error(ls, "receive_rcom_lookup dump from %d", nodeid);
 367                 dlm_dump_rsb_name(ls, rc_in->rc_buf, len);
 368                 return;
 369         }
 370
 371         error = dlm_master_lookup(ls, nodeid, rc_in->rc_buf, len,
 372                                   DLM_LU_RECOVER_MASTER, &ret_nodeid, NULL);
 373         if (error)
 374                 ret_nodeid = error;
 375         rc->rc_result = ret_nodeid;
 376         rc->rc_id = rc_in->rc_id;
 377         rc->rc_seq_reply = rc_in->rc_seq;
 378
 379         send_rcom(ls, mh, rc);
 380 }
 381
 382 static void receive_rcom_lookup_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 383 {
 384         dlm_recover_master_reply(ls, rc_in);
 385 }
 386
 387 static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb,
 388                            struct rcom_lock *rl)
 389 {
 390         memset(rl, 0, sizeof(*rl));
 391
 392         rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid);
 393         rl->rl_lkid = cpu_to_le32(lkb->lkb_id);
 394         rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags);
 395         rl->rl_flags = cpu_to_le32(lkb->lkb_flags);
 396         rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq);
 397         rl->rl_rqmode = lkb->lkb_rqmode;
 398         rl->rl_grmode = lkb->lkb_grmode;
 399         rl->rl_status = lkb->lkb_status;
 400         rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type);
 401
 402         if (lkb->lkb_bastfn)
 403                 rl->rl_asts |= DLM_CB_BAST;
 404         if (lkb->lkb_astfn)
 405                 rl->rl_asts |= DLM_CB_CAST;
 406
 407         rl->rl_namelen = cpu_to_le16(r->res_length);
 408         memcpy(rl->rl_name, r->res_name, r->res_length);
 409
 410         /* FIXME: might we have an lvb without DLM_LKF_VALBLK set ?
 411            If so, receive_rcom_lock_args() won't take this copy. */
 412
 413         if (lkb->lkb_lvbptr)
 414                 memcpy(rl->rl_lvb, lkb->lkb_lvbptr, r->res_ls->ls_lvblen);
 415 }
 416
 417 int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
 418 {
 419         struct dlm_ls *ls = r->res_ls;
 420         struct dlm_rcom *rc;
 421         struct dlm_mhandle *mh;
 422         struct rcom_lock *rl;
 423         int error, len = sizeof(struct rcom_lock);
 424
 425         if (lkb->lkb_lvbptr)
 426                 len += ls->ls_lvblen;
 427
 428         error = create_rcom(ls, r->res_nodeid, DLM_RCOM_LOCK, len, &rc, &mh);
 429         if (error)
 430                 goto out;
 431
 432         rl = (struct rcom_lock *) rc->rc_buf;
 433         pack_rcom_lock(r, lkb, rl);
 434         rc->rc_id = (unsigned long) r;
 435
 436         send_rcom(ls, mh, rc);
 437  out:
 438         return error;
 439 }
 440
 441 /* needs at least dlm_rcom + rcom_lock */
 442 static void receive_rcom_lock(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 443 {
 444         struct dlm_rcom *rc;
 445         struct dlm_mhandle *mh;
 446         int error, nodeid = rc_in->rc_header.h_nodeid;
 447
 448         dlm_recover_master_copy(ls, rc_in);
 449
 450         error = create_rcom(ls, nodeid, DLM_RCOM_LOCK_REPLY,
 451                             sizeof(struct rcom_lock), &rc, &mh);
 452         if (error)
 453                 return;
 454
 455         /* We send back the same rcom_lock struct we received, but
 456            dlm_recover_master_copy() has filled in rl_remid and rl_result */
 457
 458         memcpy(rc->rc_buf, rc_in->rc_buf, sizeof(struct rcom_lock));
 459         rc->rc_id = rc_in->rc_id;
 460         rc->rc_seq_reply = rc_in->rc_seq;
 461
 462         send_rcom(ls, mh, rc);
 463 }
 464
 465 /* If the lockspace doesn't exist then still send a status message
 466    back; it's possible that it just doesn't have its global_id yet. */
 467
 468 int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in)
 469 {
 470         struct dlm_rcom *rc;
 471         struct rcom_config *rf;
 472         struct dlm_mhandle *mh;
 473         char *mb;
 474         int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);
 475
 476         mh = dlm_lowcomms_get_buffer(nodeid, mb_len, GFP_NOFS, &mb);
 477         if (!mh)
 478                 return -ENOBUFS;
 479         memset(mb, 0, mb_len);
 480
 481         rc = (struct dlm_rcom *) mb;
 482
 483         rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
 484         rc->rc_header.h_lockspace = rc_in->rc_header.h_lockspace;
 485         rc->rc_header.h_nodeid = dlm_our_nodeid();
 486         rc->rc_header.h_length = mb_len;
 487         rc->rc_header.h_cmd = DLM_RCOM;
 488
 489         rc->rc_type = DLM_RCOM_STATUS_REPLY;
 490         rc->rc_id = rc_in->rc_id;
 491         rc->rc_seq_reply = rc_in->rc_seq;
 492         rc->rc_result = -ESRCH;
 493
 494         rf = (struct rcom_config *) rc->rc_buf;
 495         rf->rf_lvblen = cpu_to_le32(~0U);
 496
 497         dlm_rcom_out(rc);
 498         dlm_lowcomms_commit_buffer(mh);
 499
 500         return 0;
 501 }
 502
 503 /*
 504  * Ignore messages for stage Y before we set
 505  * recover_status bit for stage X:
 506  *
 507  * recover_status = 0
 508  *
 509  * dlm_recover_members()
 510  * - send nothing
 511  * - recv nothing
 512  * - ignore NAMES, NAMES_REPLY
 513  * - ignore LOOKUP, LOOKUP_REPLY
 514  * - ignore LOCK, LOCK_REPLY
 515  *
 516  * recover_status |= NODES
 517  *
 518  * dlm_recover_members_wait()
 519  *
 520  * dlm_recover_directory()
 521  * - send NAMES
 522  * - recv NAMES_REPLY
 523  * - ignore LOOKUP, LOOKUP_REPLY
 524  * - ignore LOCK, LOCK_REPLY
 525  *
 526  * recover_status |= DIR
 527  *
 528  * dlm_recover_directory_wait()
 529  *
 530  * dlm_recover_masters()
 531  * - send LOOKUP
 532  * - recv LOOKUP_REPLY
 533  *
 534  * dlm_recover_locks()
 535  * - send LOCKS
 536  * - recv LOCKS_REPLY
 537  *
 538  * recover_status |= LOCKS
 539  *
 540  * dlm_recover_locks_wait()
 541  *
 542  * recover_status |= DONE
 543  */
 544
 545 /* Called by dlm_recv; corresponds to dlm_receive_message() but special
 546    recovery-only comms are sent through here. */
 547
 548 void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
 549 {
 550         int lock_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_lock);
 551         int stop, reply = 0, names = 0, lookup = 0, lock = 0;
 552         uint32_t status;
 553         uint64_t seq;
 554
 555         switch (rc->rc_type) {
 556         case DLM_RCOM_STATUS_REPLY:
 557                 reply = 1;
 558                 break;
 559         case DLM_RCOM_NAMES:
 560                 names = 1;
 561                 break;
 562         case DLM_RCOM_NAMES_REPLY:
 563                 names = 1;
 564                 reply = 1;
 565                 break;
 566         case DLM_RCOM_LOOKUP:
 567                 lookup = 1;
 568                 break;
 569         case DLM_RCOM_LOOKUP_REPLY:
 570                 lookup = 1;
 571                 reply = 1;
 572                 break;
 573         case DLM_RCOM_LOCK:
 574                 lock = 1;
 575                 break;
 576         case DLM_RCOM_LOCK_REPLY:
 577                 lock = 1;
 578                 reply = 1;
 579                 break;
 580         };
 581
 582         spin_lock(&ls->ls_recover_lock);
 583         status = ls->ls_recover_status;
 584         stop = test_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
 585         seq = ls->ls_recover_seq;
 586         spin_unlock(&ls->ls_recover_lock);
 587
 588         if (stop && (rc->rc_type != DLM_RCOM_STATUS))
 589                 goto ignore;
 590
 591         if (reply && (rc->rc_seq_reply != seq))
 592                 goto ignore;
 593
 594         if (!(status & DLM_RS_NODES) && (names || lookup || lock))
 595                 goto ignore;
 596
 597         if (!(status & DLM_RS_DIR) && (lookup || lock))
 598                 goto ignore;
 599
 600         switch (rc->rc_type) {
 601         case DLM_RCOM_STATUS:
 602                 receive_rcom_status(ls, rc);
 603                 break;
 604
 605         case DLM_RCOM_NAMES:
 606                 receive_rcom_names(ls, rc);
 607                 break;
 608
 609         case DLM_RCOM_LOOKUP:
 610                 receive_rcom_lookup(ls, rc);
 611                 break;
 612
 613         case DLM_RCOM_LOCK:
 614                 if (rc->rc_header.h_length < lock_size)
 615                         goto Eshort;
 616                 receive_rcom_lock(ls, rc);
 617                 break;
 618
 619         case DLM_RCOM_STATUS_REPLY:
 620                 receive_sync_reply(ls, rc);
 621                 break;
 622
 623         case DLM_RCOM_NAMES_REPLY:
 624                 receive_sync_reply(ls, rc);
 625                 break;
 626
 627         case DLM_RCOM_LOOKUP_REPLY:
 628                 receive_rcom_lookup_reply(ls, rc);
 629                 break;
 630
 631         case DLM_RCOM_LOCK_REPLY:
 632                 if (rc->rc_header.h_length < lock_size)
 633                         goto Eshort;
 634                 dlm_recover_process_copy(ls, rc);
 635                 break;
 636
 637         default:
 638                 log_error(ls, "receive_rcom bad type %d", rc->rc_type);
 639         }
 640         return;
 641
 642 ignore:
 643         log_limit(ls, "dlm_receive_rcom ignore msg %d "
 644                   "from %d %llu %llu recover seq %llu sts %x gen %u",
 645                    rc->rc_type,
 646                    nodeid,
 647                    (unsigned long long)rc->rc_seq,
 648                    (unsigned long long)rc->rc_seq_reply,
 649                    (unsigned long long)seq,
 650                    status, ls->ls_generation);
 651         return;
 652 Eshort:
 653         log_error(ls, "recovery message %d from %d is too short",
 654                   rc->rc_type, nodeid);
 655 }
 656